SKU:S970
Twin Eocene Marsh Fly Fossils from Green River
Twin Eocene Marsh Fly Fossils from Green River
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It is rare enough to discover a single insect preserved for millions of years—but finding two Marsh Flies (Plecia pealei) preserved on the same stone is a truly fascinating glimpse into the distant past. These insects lived approximately 51 million years ago, when warm forests and tranquil freshwater lakes covered what is now southwestern Wyoming during the Eocene Epoch.
Specimen Details
✓ Species: Plecia pealei (Marsh Fly)
✓ Age: Eocene (~51 million years old)
✓ Formation: Green River Formation
✓ Location: Kemmerer, Wyoming, USA
✓ Specimen Size: Approximately 65 × 58 × 8 mm
✓ Fly Sizes: Approximately 12 × 7 mm & 9 × 5 mm
✓ Weight: 50 g
✓ Authenticity: 100% Authentic natural fossil
✓ Display: Excellent collector, educational, or gift specimen
This authentic fossil originates from the celebrated Green River Formation, one of the finest fossil localities ever discovered. During the Eocene, a chain of peaceful lakes occupied this region, where microscopic layers of sediment settled continuously across the lake floor. Organisms that came to rest in these calm waters were rapidly buried before decomposition could occur. Over millions of years, these sediments hardened into fine-grained limestone, preserving extraordinary details of prehistoric life.
The Green River Formation is renowned for producing some of the world's best-preserved fossils, providing scientists with an exceptional record of an ancient freshwater ecosystem. Although fossil fish are its most famous discoveries, insect fossils are encountered far less frequently. A specimen preserving two Marsh Flies together is especially appealing, offering a unique snapshot of life from an ecosystem that disappeared millions of years ago.
Whether displayed as the highlight of a fossil collection, used as an educational specimen, or presented as an unforgettable gift, this twin Marsh Fly fossil is a genuine piece of Earth's natural history and a remarkable reminder of the incredible events that shaped life on our planet.
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Before You Add to Cart ✨
Before You Add to Cart ✨
Online Only: This exact piece is available online only. Similar pieces may be available in store so please check with us before you visit Forever Gems in Franschhoek. Want to view it in-store? Just ask — we’ll arrange it.
Photos: We shoot for accuracy, but colors may vary slightly by screen or lighting.
Size & Weight: Full details are in the description. Please check before buying.
What You See Is What You Get: The item pictured is the exact piece you’ll receive.
Authenticity Guaranteed 🛡️
Authenticity Guaranteed 🛡️
Every specimen at Forever Gems is personally hand-selected and verified. We source exclusively from trusted IMCA-registered dealers, artisanal miners, and long-standing partners we meet with annually at the Tucson Gem and Mineral Show.
Any replica or reproduction fossils are always clearly labeled and sold separately.
Lifetime Authenticity Guarantee
We stand behind the authenticity of every fossil we sell. If a fossil purchased from Forever Gems can be scientifically proven not to be authentic, it may be returned at any time for a full refund, provided supporting proof is supplied. This lifetime authenticity guarantee is in addition to our standard 30-day return policy.
Rather than paper certificates, we rely on over 13 years of experience, expert knowledge, and trusted supplier relationships to ensure authenticity and quality.
Shipping & Collection 🚚
Shipping & Collection 🚚
We ship nationwide with The Courier Guy and RAM Hand-to-Hand Couriers primarily and worldwide with FedEx. Tracking provided on all orders.
Local pickup: Wellington by appointment, Franschhoek Store Fri–Sun, or Franschhoek Village Market Saturdays (weather permitting).
Own courier: We’ll notify you when ready for collection from Wellington, SA.
International: Shipping options show at checkout. Duties/taxes, if any, are paid by the buyer.
All specimens are securely packaged to arrive safely. Questions? Contact us
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